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4 years ago

How long do balloons stay inflated with helium

Chemistry

1 answer:

mel-nik [20]4 years ago

7 0

Answer:

Balloons last between 12-21 hours filled with helium

Explanation:

latex balloons generally last between 12-20 hours filled with helium, and about 2-3 days when treated with Hi-Float

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A flame test of a colorless solution gives a bright yellow color. When reacted with AgNO3 a white precipitate forms that dissolv

hichkok12 [17]

Answer:

The compound is Na2CO3

Explanation:

A flame test of a colorless solution gives a bright yellow color. The yellow color shows the presence of Sodium.

NaX + AgNO3 → AgX + NaNO3

When reacted with AgNO3 a white precipitate.

AgX + HNO3 → AgNO3 + H2O + CO2

A white precipitate will be formed when AgNO3 reacts with Sodium Chloride (NaCl) or Sodium carbonate(Na2CO3). (Also NaF, Na3PO4 are possible).

When HCL is added to the unknown solution, bubbles form.

Forming bubbles means that there is formed CO2 (and H20)

Na2X + 2HCl → 2NaCl + H2O + CO2

To form CO2 there is carbon needed

This shows that X is CO3 and the compound is Na2CO3

To control:

Na2CO3 + AgNO3 → Ag2CO3 + NaNO3

⇒Ag2Co3 is the white precipitate formed

This precipitate Ag2CO3 + HNO3 will disolve in AgNO3, CO2 and H2O

When Na2CO3 reacts with HCl there is formed NaCL together with bubbles ( which is CO2 and H2O).

The compound is Na2CO3

3 0

3 years ago

What is the mass of 4.40 moles of magnesium chloride, MgCl2?

Darya [45]

Since the number of moles of a substance is the mass divided by the molar mass of the substance, we can just simply multiply the molar mass of magnesium chloride by the number of moles, which is 4.40 in this case.

To find the molar mass, refer to the periodic table for the relative atomic mass of Mg and Cl and add them together. Since there’s 2 chloride ions in MgCl2, double the relative atomic mass of Cl when adding.

24.31 + 35.45x2
=95.21

Now just multiply 95.21 to 4.40mol, which you’ll get 418.9g (corrected to 3 significant figures)

3 0

3 years ago

Suppose now that you wanted to determine the density of a small crystal to confirm that it is boron. From the literature, you kn

Phantasy [73]

Answer:

the volume of CHCI3 = 7.87 ml

the volume of CHBr3 = 12.13 ml

Explanation:

From the given information:

We all know that 1 g/cm^3 = 1 g/ml

The density of boron = 2.34 g/ml

The Volume of the liquid mixture = 20 ml

Recall that:

Density = mass/volume

Mass = Density × Volume

Mass = 2.34 g/ml × 20 ml

Mass = 46.8 g

Suppose the volume of CHCI3 be Y and the Volume of CHBr3 be 20 - Y

Then :

Y (1.492) + 20-Y(2.890) = 46.8

1.492Y + 57.8 - 2.890Y = 46.8

- 1.398 Y = -11

Y = -11/ - 1.398

Y = 7.87 ml

Therefore, the volume of CHCI3 7.87 ml

the volume of CHBr3 = 20 - Y

= 20 - 7.87

= 12.13 ml

3 0

3 years ago

What is the chemical formula for the compound formed between sodium and iodine?

IrinaK [193]

Each compound will be neutral

6 0

3 years ago

Answer choices Metals Metalloids nonmetals

lbvjy [14]

Answer:

nonmetals

Explanation:

the answer is nonmetals

7 0

3 years ago

Read 2 more answers